docs: add migration guide for docs deploy index action (#586)

Co-authored-by: Jorge Martínez <[email protected]>

doc/source/migrations/index.rst

@@ -9,26 +9,21 @@ have been updated.
 
 Development version
 -------------------
-
-**New features:**
-
-- Added an optional input to the ``ansys/actions/build-library`` action to disable library build
-  validation on demand using the ``validate-build: false`` argument. This is useful when you want to
-  skip the library build validation step in the action.
-- Incorporated the usage of `Trusted Publisher <https://docs.pypi.org/trusted-publishers/>`_ in the
-  ``ansys/actions/release-pypi-*`` actions. This is useful when you want to sign the package before
-  uploading it to PyPI.
-
 **Breaking changes:**
 
 - Use secrets for commit and push credentials within ``ansys/actions/doc-changelog``,
   ``ansys/actions/doc-deploy-changelog``, ``ansys/actions/doc-deploy-dev``, and
   ``ansys/actions/doc-deploy-stable``.
 
-**Migration steps:**
+**Deprecated features:**
 
-- To set up your repository to use the ``ansys/actions/release-pypi-*`` action with the `Trusted Publisher`_ approach,
-  see the :ref:`release_pypi_trusted_publisher`.
+- The ``ansys/actions/doc-deploy-index`` action has been deprecated and will be removed in the next release.
+  With the deprecation of ``pymeilisearch`` and the adoption of a static search index via the ``ansys-sphinx-theme``,
+  the ``ansys/actions/doc-deploy-index`` action is no longer necessary.
+
+- The ``ansys/actions/commit-style`` action has been renamed to ``ansys/actions/check-pr-title``.
+
+**Migration steps:**
 
 - Add the following required inputs to ``ansys/actions/doc-changelog``, ``ansys/actions/doc-deploy-changelog``,
   ``ansys/actions/doc-deploy-dev``, and ``ansys/actions/doc-deploy-stable``:
@@ -38,6 +33,24 @@ Development version
     bot-user: ${{ secrets.PYANSYS_CI_BOT_USERNAME }}
     bot-email: ${{ secrets.PYANSYS_CI_BOT_EMAIL }}
 
+Version ``v7``
+--------------
+
+**New features:**
+
+- Added an optional input to the ``ansys/actions/build-library`` action to disable library build
+  validation on demand using the ``validate-build: false`` argument. This is useful when you want to
+  skip the library build validation step in the action.
+
+- Incorporated the usage of `Trusted Publisher <https://docs.pypi.org/trusted-publishers/>`_ in the
+  ``ansys/actions/release-pypi-*`` actions. This is useful when you want to sign the package before
+  uploading it to PyPI.
+
+**Migration steps:**
+
+- To set up your repository to use the ``ansys/actions/release-pypi-*`` action with the `Trusted Publisher`_ approach,
+  see the :ref:`release_pypi_trusted_publisher`.
+
 Version ``v6``
 --------------